Q9 of 113 Page 584

Prove that


To prove: tan( )+ tan( ) = 2secx


Proof: Consider, L.H.S = tan( )+ tan( )


tan( )+ tan( ) = +


()


= +


= +


= +


=


By Expanding the numerator we get,


= ()


tan( )+ tan( ) = 2secx = R.H.S


since L.H.S = R.H.S, Hence proved.


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